It'd be best to open a case in the Support Center to have this investigated on an account level.
Please reach out to our Account and Billing Support team to review the charges linked to your db.r6g.2xlarge instance and also help confirm if this is still running and accruing any unintended charges.
You can use this link to quickly visit the Support Center: https://console.aws.amazon.com/support/home.
- Kraig E.
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